Rainbow Dash isn't having a good day.
She woke up lost, in a body that clearly isn't hers, no memory of how she got where she is, and she's being chased by creatures from the depths of Tartarus. Super fun.
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Ruby Rose is having a wonderful day.
Her team has been sent into Forever Fall on their first solo mission, to investigate recent sightings of Grimm. A bit low-key, but Team RWBY has needed the break since the last fight with the White Fang.
She's investigating some tracks when she hears a scream echo through the forest.

What she finds will change their lives forever.
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MLP/RWBY Crossver. No Ruby/Dash ships. If you want that, make your own.
Set post Season 2 of MLP, and post Volume 2 of RWBY; the tournament has not happened yet.

If you've never heard of RWBY, go to RoosterTeeth's Youtube playlist right the buck now and watch it. it is in reverse order, unfortunately but deal with it. Watch the four trailers first.

Not quite sure yet how far I'm going to take this, but I'll figure that out as I go along.